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   Articles with "doppler shift" as a keyword



Precise Doppler shift compensation in the hipposiderid bat, Hipposideros armiger

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recommendations! Published in 2018 at "Scientific Reports"

DOI: 10.1038/s41598-018-22880-y

Abstract: Bats of the Rhinolophidae and Hipposideridae families, and Pteronotus parnellii, compensate for Doppler shifts generated by their own flight movement. They adjust their call frequency such that the frequency of echoes coming from ahead fall… read more here.

Keywords: shift compensation; frequency; doppler; doppler shift ... See more keywords

Doppler shift in semi-Riemannian signature and the non-uniqueness of the Krein space of spinors

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recommendations! Published in 2019 at "Journal of Mathematical Physics"

DOI: 10.1063/1.5080525

Abstract: We give examples illustrating the fact that the different space/time splittings of the tangent bundle of a semi-Riemannian spin manifold give rise to non-equivalent norms on the space of compactly supported sections of the spinor… read more here.

Keywords: semi riemannian; doppler shift; space; shift semi ... See more keywords

Reversal of orbital angular momentum arising from an extreme Doppler shift

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recommendations! Published in 2018 at "Proceedings of the National Academy of Sciences of the United States of America"

DOI: 10.1073/pnas.1720776115

Abstract: Significance The emergence of “negative” frequencies in physical systems is often accompanied by intriguing consequences. For example, supersonic motion between a source and an observer leads to a negative Doppler-shifted frequency, the physical meaning of… read more here.

Keywords: shift; reversal; angular momentum; doppler ... See more keywords

Modal analysis of Doppler shift and strain time histories extracted from distributed fiber optic sensing data

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recommendations! Published in 2025 at "Smart Materials and Structures"

DOI: 10.1088/1361-665x/ada59a

Abstract: While fiber optic sensing systems (FOSS) operate through a variety of technologies, optical frequency domain reflectometry (OFDR) has emerged as a means for distributed sensing, wherein a single fiber contains hundreds to thousands of sensing… read more here.

Keywords: time histories; doppler shift; strain; time ... See more keywords

Toward Device-Free Micro-Gesture Tracking via Accurate Acoustic Doppler-Shift Detection

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recommendations! Published in 2019 at "IEEE Access"

DOI: 10.1109/access.2018.2886279

Abstract: As a universal interaction method, hand and finger gestures can express people’s intention directly and clearly in daily life, and has been one of the hotspots in human–computer interaction community. In this paper, we present… read more here.

Keywords: finger; shift; device free; doppler shift ... See more keywords

Intermittently Nonlinear Impulsive Noise Mitigation and Doppler Shift Compensation in UWA-OFDM Systems

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recommendations! Published in 2019 at "IEEE Access"

DOI: 10.1109/access.2019.2904010

Abstract: Impulsive noise (IN) and Doppler shift can significantly degrade the performance of orthogonal frequency-division multiplexing (OFDM)-based underwater acoustic (UWA) communication systems. In this paper, we propose a receiver structure that deals efficiently with both these… read more here.

Keywords: doppler; shift compensation; impulsive noise; doppler shift ... See more keywords

Doppler Shift Estimation for Space-Based AIS Signals Over Satellite-to-Ship Links

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recommendations! Published in 2019 at "IEEE Access"

DOI: 10.1109/access.2019.2921915

Abstract: As a communication system for maritime monitoring and navigation, automatic identification system (AIS) has been employed for many years, but its service range is limited in 40 nautical miles. Fortunately, an updated service navigation system… read more here.

Keywords: shift; based ais; estimation; space based ... See more keywords

Acquisition of Time and Doppler Shift in WFRFT Encrypted Chaotic Direct Sequence Spread Spectrum System

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recommendations! Published in 2022 at "IEEE Access"

DOI: 10.1109/access.2022.3220891

Abstract: Weighted fractional Fourier transform encrypted chaotic direct sequence spread spectrum (WFRFT-CD3S) signal is aperiodic and complex Gaussian distributed. The aperiodicity and complex Gaussian distribution are conducive to the covert transmission of information but also make… read more here.

Keywords: chaotic direct; encrypted chaotic; doppler shift; sequence ... See more keywords

Leveraging Multi-LEO Satellite Signals for Opportunistic Positioning

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recommendations! Published in 2024 at "IEEE Access"

DOI: 10.1109/access.2024.3456382

Abstract: The study of navigation solutions other than GNSS is becoming increasingly important due to growing concerns about the vulnerability of GNSS to interference. The use of existing LEO satellite signals is a promising option in… read more here.

Keywords: leveraging multi; doppler shift; multi leo; leo satellite ... See more keywords

Referenceless Doppler Shift and Rate Estimation for Opportunistic Positioning With OneWeb Signals

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recommendations! Published in 2025 at "IEEE Access"

DOI: 10.1109/access.2025.3628200

Abstract: We propose a technique for extracting the Doppler shift and its rate from OneWeb’s Ku-band user downlink signals and demonstrate its suitability for opportunistic positioning. Since the downlink waveform and synchronization sequences are not publicly… read more here.

Keywords: opportunistic positioning; shift; doppler shift; shift rate ... See more keywords

Sequential Doppler-Shift-Based Optimal Localization and Synchronization With TOA

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recommendations! Published in 2022 at "IEEE Internet of Things Journal"

DOI: 10.1109/jiot.2022.3150564

Abstract: Doppler shift is an important measurement for localization and synchronization (LAS), and is available in various practical systems. Existing studies on LAS techniques in a time-division broadcast LAS system (TDBS) only use sequential time-of-arrival (TOA)… read more here.

Keywords: doppler shift; localization synchronization; sequential doppler; las sdt ... See more keywords